# vim: set filencoding=utf8
"""
Foundry Template Filters

@author: Mike Crute (mcrute@gmail.com)
@organization: SoftGroup Interactive, Inc.
@date: May 03, 2010
"""


from datetime import datetime
from foundry.utils import frozendict


def pluralize(word, how_many=1):
    "Naive pluralization function."
    return word if how_many == 1 else word + "s"


def nice_date_delta(from_date, to_date=datetime.now()):
    """
    Provides a friendly text representation (ie. 7 months)
    for the delta between two dates.
    """
    delta = to_date - from_date

    months = delta.days / 30
    if months > 0:
        return "{0} {1}".format(months, pluralize("month", months))

    weeks = delta.days / 7
    if weeks > 0:
        return "{0} {1}".format(weeks, pluralize("week", weeks))

    if delta.days > 0:
        return "{0} {1}".format(delta.days, pluralize("day", delta.days))

    hours = delta.seconds / (60 * 60)
    if hours > 0:
        return "{0} {1}".format(hours, pluralize("hour", hours))

    minutes = delta.seconds / 60
    if minutes > 0:
        return "{0} {1}".format(minutes, pluralize("minute", minutes))

    return "seconds ago"


#: Template filter registry
TEMPLATE_FILTERS = frozendict({
    'nice_date_delta': nice_date_delta,
    'pluralize': pluralize,
})